Dates and times for posts and surveys

[Angamanga]

Overview

The output of this epic is to standardise input, save and display of dates and times for posts and date/time fields in surveys all over the platform

Problem

Timestamps and date-time information is displayed and saved differently in platform. At some places, time is adjusted to the settings in the users computer, and sometimes it is displayed in UTC.

Goal

For survey-fields:

• Save and display the time in the timezone the user have on their computer
• Add a toggle that switches to the time and timezone the value was added in
• Clearly display what timezone a time is displayed in
• Add information about the timezone a value is added in the database and return this information (It is currently saved in UTC but without any information about the timezone).

For posts:

• Save post_date in UTC
• Save information about the timezone a post is added in in the database and return this information if its available. (It is currently saved in UTC but without any information about the timezone).
• Adjust the metadata in a post to display the timezone that the user has in their computer-settings
• Clearly display what timezone the post is displayed in

Issues included in this epic:

Related to survey-fields
#4162
#3961

Related to post-time-stamp
#4158
#4072
#3183
#2329
#4388

Related to time-handling in general
#4159 (new feature)
#2085

Aha! Link: https://ushahiditeam.aha.io/features/PROD-903

[Angamanga]

@Ifycode For context when working with Moment.js